Gary Moore wasn't that old. I actually preferred Thin Lizzy with just Eric Bell on guitar but Moore was quite talented at what he did. It could be that substance abuse issues caught up with him
Gary Moore found dead

Rock legend Gary Moore was found dead Sunday in a hotel room in Spain, where he had been vacationing. The Thin Lizzy guitarist was 58.

The rocker was found laying unconscious in the lavish Kempinski hotel on Spain's Costa del Sol by his girlfriend and later pronounced dead, according to several reports.

Considered one of the greatest blues-based rock guitarists of the '70s, an era that also boasted the likes of Jimmy Page and Eric Clapton, Moore joined Thin Lizzy in the mid-1970s and later enjoyed a successful solo career.

"When the snows fall and the white winds blow, the lone wolf dies but the pack survives."
Winter is Coming

Now this is the Law of the Jungle—as old and as true as the sky; And the wolf that shall keep it may prosper, but the wolf that shall break it must die.
As the creeper that girdles the tree-trunk, the Law runneth forward and back; For the strength of the Pack is the Wolf, and the strength of the Wolf is the Pack.