Is 22 really too young to get engaged?

Hey guys! This has just been on my mind and I want to know if this is really that hot of a take without sounding stupid to the people around me, please let me know your thoughts!

Me (21, female) and my boyfriend (21, male) have been dating for about 3 years. We met in high school and dated for a short while our freshman year in high school and stayed good friends after ending things on good terms. We've been in each others lives for over 6 years. Now I am not engaged but we have talked about things like what kind of ring I want and our lives together after marriage. We have lived together for a year, have our own apartment, and we're currently saving to get a home together. In recent months my boyfriend had two seizures for the first time in his life so we've been through multiple E.R visits, ambulance rides, and long hard days of figuring out what his future will look like. Through the hardship it only brought us closer together and made our bond that much more solid. Needless to say this is the man I can't wait to spend the rest of my life with and there is zero doubt in my mind that this is the person ill be starting a family with one day.

Now, I work with people much older than me (in the 30's to 50's range) and there was a conversation in the office about Millie Bobby Brown getting married at the age her and her husband are. There were so many horrible things thrown around like "they'll be divorced in a few years" "They are both still babies!" and " I remember being that age once too, they'll learn the hard way." So I'm left wondering if its really that hot of a take that two people my age can truly be in love with each other and not need to experience other people to know that? We have both had multiple partners before one and other and still do all the partying and living our life that everyone else does- we simply do it together and love life that way. I am really hoping to have a ring in the next year but the people around me think getting married at this age is so "stupid" and nothing more than a future regret.

Reddit, is it really that hot of a take that people in their early 20's can get married and it not end up in disaster?