A man aged sixty-five who fasts one day and breaks the fast the next, and adds to that by fasting on Mondays and Thursdays

Question:
He says: Honorable Shaykh, may Allah grant you success. He says: I am a man of sixty-five years, and I fast one day and break the fast the next, and I add to that by fasting on Mondays and Thursdays, the white days, six days of Shawwal, and I fast more in Sha'ban, knowing that I have the capacity to fast. His question is: Is my action in accordance with the Sunnah or not? May Allah grant you success.

Answer:
Yes. The best of fasting, as the Prophet (peace and blessings be upon him) said, is the fasting of Dawud. This suffices for the fasting of Mondays and Thursdays. Three days of every month are included in this; they are included in the fasting of Dawud (peace be upon him). Yes.