My hawthorn tree has lots of blossom every Spring, but this is not followed by haws (berries) : why not? I understand it simply needs insects to pollinate the flowers and these have not been in short supply.
Is it the common type with single white flowers, or the double red flowered sort?
You don't stop doing new things because you get old, you get old because you stop doing new things.
The latter - Paul's Scarlet.