Don't trust anyone over thirty.
A cat may look at a king Link to proverb.
A problem shared is a problem halved Link to proverb.
The opera ain't over till the fat lady sings Link to proverb.
If ifs and ands were pots and pans there'd be no work for tinkers.
Bird in the hand is worth two in the bush - A.
Don't change horses in midstream Link to proverb.