Metallica,
Facial hair may be a better indication. Quantity of facial hair still varies among men, but perhaps not as much as hair elsewhere.
Actually, what am I saying. Probably the best indication is pubic hair, although there is still variation there.
I was a late bloomer too. I’m very hairy now (40 years old). I started to get a lot of chest hair in my mid to late 20s. It has gone elsewhere since then!
But all the indications of puberty occurred later in me than most of my male friends—change of voice, muscle development, pubic and facial hair, etc.
As to your question, I think that for me the answer is yes. Pre PE I was 7 x 5. I don’t remember being that big when I was 15-18 and when I was banging my first few girlfriends (the good old days!).
But to be honest with you, the memory is hazy.