You must be 65 or older especially if you got the 1040SR form.
For 2019 the standard deduction amounts are:
Single 12,200 + 1,650 for 65 and over or blind = 13,850
HOH 18,350 + 1,650 for 65 and over or blind
Joint 24,400+ 1,300 for each 65 and over or blind
Married filing Separate 12,200 + 1,300 for 65 and over or blind
