You think it is your age. Your lips got thinner, drier, lined. Lipstick stopped working and you stopped wearing it. Most women do.
It is not your age. You did not get too old for lipstick. Every lipstick you tried was built for 25-year-old lips that do not need moisture and do not have lines for wax to settle into. The product failed you. You did not fail the product.
"The mouth has gone liney," I wrote on a forum once. "Please tell me your secrets to make it stop wandering off." No one answered. They were all in the same drawer.