Our solution on 'The Simpsons' is to do jokes that people who have an education or some frame of reference can get. And for the ones who don't it doesn't matter because we have Homer banging his head and saying 'D'oh!'
Wrinkles should merely indicate where smiles have been.
Anyone who stops learning is old whether at twenty or eighty. Anyone who...
Age is an issue of mind over matter. If you don't mind it doesn't matter.