I usually just play with aging off. I age babies up after 3 days because they cry too much. For toddlers, I age them up when they max all skills or when I get bored. I age up kids after they receive an A, I’m not really focused on aspirations, unless it plays into their storyline. Teens age up with an A as well.
As far as seasons go, I usually run spring and summer on 28 days, because I tend to send my sims fishing a lot.
Fall and winter lasts anywhere between 7 and 14 days. It really just depends on my mood lol.