Figure me out

My age - 11

5+6=11, 20-9=11, 1x11, 222=11.

My birth month - November - 11

10+1=11, 13-2=11, 1x11=11, 444=11

My birthdate - 21

20+1=21, 25-4=21, 3x7=21, 1055= 21.

My Shoe Size - 10

5+5=10, 20-10=10, 2x5=10, 10010=10

The Number on my Letterbox - 4

1+3=4, 20-16=4, 1x4=, 40=4

The number of movies I watched this year - 16

16+0=16, 20-4=16, 2x8=16, 322 = 16

The Number of songs that are my favourite - 28

14+14=28, 30-2=28, 4x7=28, 562=28

The Number of friends I have - 125

120+5=125, 130-5=125, 5x25, 2502=125

The number of the letter in my name - 6

3+3=6, 10-4=6, 3x2=6, 122=6

The number of siblings I have - 4

3+1=4, 10-6=4, 4x0=4 , 14=4