Does yahrzeit ever conclude?

Dear Rabbi

I’ve been told that after 50 years we stop observing a yahrzeit, but have not found a source. Have you heard of this?


Dear Jemima,

And to think people still commemorate the yahrtzeit of Moses 3,300 years on – someone should tell them! A yahrtzeit commemorates the life of a loved one and reflecting on the elevation of the soul as it transpires each year. Why should that stop at any given time?