This is quite common in the elderly, the skin thins veins become larger and its easy to open one up.
Done quite a few of these plus a few murders (

not personally you understand) and attempted murders where there has been masses of blood and worse

One of the worst that I visited (but refused) was a guy who was stabbed in the thigh, he obviously did not realise that it could and did kill him as he walked all around the property pumping blood out every where. His long time partner stabbed him after one too many beatings, he was a drug baron, bullying gangster who brought misery to many peoples lifes he even supplied drugs to some well know (at the time) premier league footballers.
I think quite a few people raised a glass to her after the event, she of course had to move away to who knows where for her own safety, she was charged with manslaughter and got a suspended prison sentence.