The average age of the men in my class at the start was 44. The oldest man was 62 and the youngest 37. A more significant factor than age is the age of one’s children. The time commitment is far greater than an advanced degree (I’ve got two earned master’s degrees and a doctorate so I speak from experience).
In addition to the time spent in classes, there’s weekend of spiritual formation, field ministry (a significant time factor) plus meetings with the deacon director, formation director, spiritual director and, if you are lucky enough, a mentor couple.
It does put a strain on a marriage and on raising children. My children were both grown and out of the house when I started (I was 44, ordained at 48 and have served for nine years as a deacon so far). There’s always the tendency to think that you’ll have better control of your life after ordination, and that’s not true. There are so many conflicting demands that it’s hard to get a real sense of control.
I’m not trying to discourage you from the diaconate (note the spelling), but I am warning you that this is a difficult road. I, of course, feel greatly blessed that the Church has discerned my call as a deacon and confirmed it with the sacrament of Holy Orders.