May I delete their?

[sim sim]

Good day!
During the last update through the 'Sinaptic' I saw that was download 
'linux-image-5.10.0-21-686-pae' and updated 'linux-image-686-pae' was updated. 
In my /boot/ among any other are archived files from 
'initrd.img-5.10.0-9-686-pae' up to 'initrd.img-5.10.0-21-686-pae', each 
53.3MiB. Their total  weight of 53*13 is huge. 
May I delete their?
 Thanks all.