The 25 year old probably does think that the 40 year old is old.
That’s human nature. Anyone who is more than 15-20 yrs older than you is old, and anyone 15-20 yrs younger is a kid. No matter how old you are. there will always be almost a generation in between.
PS no harm done, I figured you must be responding to someone else, just could not figure out who.
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