Probably a flowering pear? It has a really nice bark, but full of big thorns. It's a wild seedling that grows from a small crack in the boulders in my backyard. It has never flowered so it can't be that old. Maybe 10 years old? I trimmed it down a bit a couple of years ago to make it branch and decided to airlayer it this year before my dad accidentally cuts it off. I started the airlayer as soon as the buds were extending just before they opened.