Interesting question. I am not so much concerned with age as I am length of courtship/engagement and level of maturity and financial stability.
If you don't wish to live with someone's parents as a married couple, don't get married till you can afford to move out on your combined incomes.
I went on a few dates with a girl early last year. She was very nice, but I was slow to get my act together (I was just out of a serious relationship) and it went nowhere. We stayed friends afterwards though, and she quickly went out with someone else.
She was nineteen. Three weeks after we last went on a date, she called me to tell me she was engaged. She had met a 25 year old, fallen head over heels in love (apparently so had he) and they got engaged. Whilst I was happy for her, if you asked me then (or now, despite them still being 'engaged') I would tell you that it was too soon.
So whilst I couldn't give you a specific courtship time before engagement should reasonably occur, I do think there are some ridiculous scenarios. Still, unless you get ridiculous, I don't think there is anything wrong with getting engaged anytime in your twenties. Personally though, I'd wait another few years, probably till at least my late twenties, or perhaps early thirties.
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