Alan: Aged 70 Years.
Emily: Aged 76 Years.
Joyce: Aged 83 Years.
Emily was the wife of Alan and Joyce was their daughter.
From FreeBMD.org.uk:
Marriages Mar 1921
Day Alan G - Maddy - St.Neots 3b 619
Maddy Emily K - Day - St.Neots 3b 619
and for Joyce:
Marriages Sep 1942
Day Joyce - Grist - Bedford 3b 836
Grist James W - Day - Bedford 3b 836