Is age really just a number?!

I recently met a guy he’s 46 but look really young and nice looking, I’m 33! We’ve been talking for awhile and everything seems to be going good, until it doesn’t. I forget he’s age sometimes when we’re together but soon remember after he says something that ‘shows his age’. My question to you all is do you think ages is a factor when dating? Is 13 years a little too much of a difference? Are am I just thinking too much about it!