My wife is "at least" 5 years older than I am
A good friend of mine is married to a woman almost half his age (first and only marriage). They have two wonderful children. They're a great couple and make a good family and a warm home.
His only regret is that he "found love" so late in life - he's afraid that he might not be around to see his kids graduate, get married, start their own family... I understand how he feels
Anyway, the point of all this sermonizing is to tell you that while it's nice your friends give their input, it's ultimately up to you.
Age is but a number. Yes, it's a number that has consequences (trust me, I'm an old, old fart)... but if you're willing to accept its consequences in search of mutual joy; go for it!
And finally:
Never permit other individuals to decide what's right for you. Figuring it out for yourself is perhaps the last free choice anyone of us truly has. Make up your own mind. You'll be better off for it.
cheers,