diff --git a/changelogs/fragments/8624-cache-types.yml b/changelogs/fragments/8624-cache-types.yml
new file mode 100644
index 0000000000..8efa34b6c0
--- /dev/null
+++ b/changelogs/fragments/8624-cache-types.yml
@@ -0,0 +1,2 @@
+minor_changes:
+  - "memcached, pickle, redis, yaml cache plugins - make sure that all options are typed (https://github.com/ansible-collections/community.general/pull/8624)."
diff --git a/plugins/cache/memcached.py b/plugins/cache/memcached.py
index 0bc5256b3f..93131172c5 100644
--- a/plugins/cache/memcached.py
+++ b/plugins/cache/memcached.py
@@ -29,6 +29,7 @@ DOCUMENTATION = '''
             section: defaults
       _prefix:
         description: User defined prefix to use when creating the DB entries
+        type: string
         default: ansible_facts
         env:
           - name: ANSIBLE_CACHE_PLUGIN_PREFIX
@@ -37,13 +38,14 @@ DOCUMENTATION = '''
             section: defaults
       _timeout:
         default: 86400
+        type: integer
+        # TODO: determine whether it is OK to change to: type: float
         description: Expiration timeout in seconds for the cache plugin data. Set to 0 to never expire
         env:
           - name: ANSIBLE_CACHE_PLUGIN_TIMEOUT
         ini:
           - key: fact_caching_timeout
             section: defaults
-        type: integer
 '''
 
 import collections
diff --git a/plugins/cache/pickle.py b/plugins/cache/pickle.py
index 06b673921e..aeffa68939 100644
--- a/plugins/cache/pickle.py
+++ b/plugins/cache/pickle.py
@@ -24,6 +24,7 @@ DOCUMENTATION = '''
         ini:
           - key: fact_caching_connection
             section: defaults
+        type: path
       _prefix:
         description: User defined prefix to use when creating the files
         env:
@@ -31,6 +32,7 @@ DOCUMENTATION = '''
         ini:
           - key: fact_caching_prefix
             section: defaults
+        type: string
       _timeout:
         default: 86400
         description: Expiration timeout in seconds for the cache plugin data. Set to 0 to never expire
@@ -39,6 +41,7 @@ DOCUMENTATION = '''
         ini:
           - key: fact_caching_timeout
             section: defaults
+        type: float
 '''
 
 try:
diff --git a/plugins/cache/redis.py b/plugins/cache/redis.py
index c43b1dbb5e..e01083e863 100644
--- a/plugins/cache/redis.py
+++ b/plugins/cache/redis.py
@@ -21,6 +21,7 @@ DOCUMENTATION = '''
           - The format is V(host:port:db:password), for example V(localhost:6379:0:changeme).
           - To use encryption in transit, prefix the connection with V(tls://), as in V(tls://localhost:6379:0:changeme).
           - To use redis sentinel, use separator V(;), for example V(localhost:26379;localhost:26379;0:changeme). Requires redis>=2.9.0.
+        type: string
         required: true
         env:
           - name: ANSIBLE_CACHE_PLUGIN_CONNECTION
@@ -29,6 +30,7 @@ DOCUMENTATION = '''
             section: defaults
       _prefix:
         description: User defined prefix to use when creating the DB entries
+        type: string
         default: ansible_facts
         env:
           - name: ANSIBLE_CACHE_PLUGIN_PREFIX
@@ -37,6 +39,7 @@ DOCUMENTATION = '''
             section: defaults
       _keyset_name:
         description: User defined name for cache keyset name.
+        type: string
         default: ansible_cache_keys
         env:
           - name: ANSIBLE_CACHE_REDIS_KEYSET_NAME
@@ -46,6 +49,7 @@ DOCUMENTATION = '''
         version_added: 1.3.0
       _sentinel_service_name:
         description: The redis sentinel service name (or referenced as cluster name).
+        type: string
         env:
           - name: ANSIBLE_CACHE_REDIS_SENTINEL
         ini:
@@ -54,13 +58,14 @@ DOCUMENTATION = '''
         version_added: 1.3.0
       _timeout:
         default: 86400
+        type: integer
+        # TODO: determine whether it is OK to change to: type: float
         description: Expiration timeout in seconds for the cache plugin data. Set to 0 to never expire
         env:
           - name: ANSIBLE_CACHE_PLUGIN_TIMEOUT
         ini:
           - key: fact_caching_timeout
             section: defaults
-        type: integer
 '''
 
 import re
diff --git a/plugins/cache/yaml.py b/plugins/cache/yaml.py
index 3a5ddf3e6f..a3d6f34521 100644
--- a/plugins/cache/yaml.py
+++ b/plugins/cache/yaml.py
@@ -24,6 +24,7 @@ DOCUMENTATION = '''
         ini:
           - key: fact_caching_connection
             section: defaults
+        type: string
       _prefix:
         description: User defined prefix to use when creating the files
         env:
@@ -31,6 +32,7 @@ DOCUMENTATION = '''
         ini:
           - key: fact_caching_prefix
             section: defaults
+        type: string
       _timeout:
         default: 86400
         description: Expiration timeout in seconds for the cache plugin data. Set to 0 to never expire
@@ -40,6 +42,7 @@ DOCUMENTATION = '''
           - key: fact_caching_timeout
             section: defaults
         type: integer
+        # TODO: determine whether it is OK to change to: type: float
 '''