In the sense that you're not at the centre of power like a president or prime minister of a major power everyone is marginalised my position doesn't isn't unique in that respect. I think there are different sorts of relevance in different contexts.
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.