Finding cumulative size of files older than certain days

Shell Programming and Scripting
1

Hi All,
I've got a ton of files in a particular directory. I want to find pdf files older than 30 days in that directory and then the cumulative size of those files.

Ex:

find /home/jk/a -name "*.pdf" -mtime +30
consider it finds the below 4 files.
/home/jk/a/1.pdf
/home/jk/a/2.pdf
/home/jk/a/3.pdf
/home/jk/a/4.pdf

now I want to know the total size of these 4 files. Any help would be appreciated.

2

nevermind, i figured it out. Thanks guys

If anyone is interested I piped the output with the following

-exec ls -l {} \;| awk '{s+=$5} END {print "Total SIZE: " s}'