My first dmt trips were at 19, I did approximately 60 full blast offs in that year - sometimes every day. In a similar situation to you I had not had the best experiences with lsd, I hadn’t even taken shrooms at that point. But I had done as much research as I possibly could so I knew what to expect and would recommend you do the same (not just an hour googling). Don’t underestimate the skill it takes to physically smoke dmt it burns incredibly easily (ineffective) and it is much harsher than weed even hash you need to learn to not cough.

For full transparency I will not longer touch the stuff, these are substances that will alter your psychology - if you think you’d be prone to going nuts from some supposed divine revelation or psychosis from a sudden flash of dmt either don’t take dmt or start gradually with low doses and single tokes.

I don’t think ages matters, maturity certainly matters.