@havelmom
I don't know if you have found what you were looking for already but here are two recommendations.
Nekota doesn't go to married life but it starts in elementary school and ends in high school. Shishunki bitter change does the same too.
@havelmom There's Mizuiro Jidai, but it hasn't been translated. It starts in junior high and goes until adulthood. I think the problem is most of the manga that do that kind of thing are very laid-back, slow and fairly long, but often not interesting enough to hold fan translators' interest for the long haul.