Melon seed life span

[Worth1]

I have about 100, 45k to 200k diamonds and several elephant tusks from Africa--------- Whoops wrong forum.
Let me see oh here it is.

Melon seeds, how long can you expect to keep melon seeds mush melon cantaloupe and water melon kept in a cool dry place?
Mine are about 4 years old and would like to plant them out here in about 2 weeks.
Some are not to be found in the store.

Worth