I may be doing something wrong with Life & Death.. But even with funerals and healthy coping strategies, my sims experience nearly lifelong grief, even from sims they may have only met once. And because Sims are always dying, as is the circle of life, my Sims are constantly sad or mad due to grief. I think it's perfectly normal to experience long periods of grief for family and good friends. I don't think it makes sense to still be mourning a guy you messed around with once in high school when you're an elder. (Although I'm sure that is realistic for some people.) Maybe anyone with half a bar or less should be mourned for a few hours instead of days.
No CC or mods, playing on PC.
Edit By Crinrict: Added missing pack tag to title.