mutton dressed as a lamb
to be knee-high to a grasshopper
silver surfer
(live to a) ripe old age
(be) over the hill
get on in years
rob the cradle
feel your age
to act your age
long in the tooth
Have a romantic relationship with someone who is much younger than yourself.
Too old to do something
Someone who is growing old.
Realize that you are no longer young
Reach an age when you can no longer perform as well as before.
a person who tries to look younger by wearing clothes designed for younger people
An elderly person who uses the internet
To live until you are very old.
no to behave as someone younger
Very young or small child