An Available Man by Hilma Wolitzer

Edward Schuyler is a 60-something science teacher in his 60s when his wife dies. He is bombarded with casseroles and by single/widowed/divorced women calling him and checking up on him. In addition, his step-children decide to place a personal ad for him, and dozens of women reply.

Funny, poignant, and overall, just very delightful, this is a very fun, easy read.