A father was so grateful to his daughter's kidney donor that he decided her would do the same and help a stranger - months before his 70th birthday.
Arfon Jones was not a match himself for Seren, 19, who had fallen seriously ill after having both of her vital organs removed.
She eventually received a transplant - and her survival inspired the 69-year-old from Cardiff, Wales.
He joined a living donor scheme after she finally received the donation in April.
Mr Jones went under the knife last month and says it was the least he could do after his daughter's life was saved.
He told Radio Cymru's Bwrw Golwg why he put his hand up.
He said: "After Seren got her new kidney, she was told that I could get off the living donor list and that's when I had a very strange experience.
"It was as if I heard a voice telling me 'there is someone else who needs your kidney' and I just felt that I had to stay on the list. It's just something I felt I had to do."
He had the procedure in December and told others considering it that age shouldn't hold you back.
"I felt that I had given someone a nice Christmas present," he said.
"It felt like I'd given someone quite a nice Christmas present and it was nice to know that I'm healthy enough to donate a kidney given that I'm almost 70."
Seren spent months being on dialysis for 10 hours every night, but the call finally came
"It's such a huge gift," she said on the programme.
"Without the kidney I wouldn't be alive today, possibly, or I would certainly have had to continue with 10 hours of dialysis."
Approximately 30 out of 100 kidney transplants are from living donors.
Information on the NHS website reads: "Receiving a kidney from a living donor has many advantages over deceased kidney donation. On average, kidneys from living donors last longer and there is usually less of a wait.
"Once a potential living donor comes forward, it usually takes 3-6 months for them to have all their tests and for the operation to be arranged. If you’re not yet on dialysis but your kidneys are failing, this makes it more likely that a kidney transplant can be done before you eventually need dialysis.
"Living kidney transplants can also be can be planned in advance so they almost always happen during the day."
For more information on kidney donation, visit the NHS website here.