Grief isn't a competition. It's not worse or better because one person was only married for days before their husband died in a road traffic accident at 23, or another person died peacefully of natural causes at 94 after 68 years of being together. Its not easier or harder when a partner died suddenly and unexpectedly or after years of illness. Grief is grief. Your experience of grief doesn't lessen mine, it's just different. I can care for you and you can care for me.
I was widowed at 50 when Tim, who I expected would be my happy-ever-after following a marriage break-up, died suddenly from heart failure linked to his type 2 diabetes. Though we'd known each other since our early 20s, we'd been married less than ten years.