Unable to retrieve value into a variable using get-aduser

I am using the following commandlet to get the list of last password set and then using a variable to get the value and add -365 to it, however this variable is not getting populated.
I can see the commandlet work and output values but the variable I am using $PWdLastSet.passwordlastset   is not getting any value, am I doing something wrong ? 

$PWdLastSet = get-aduser -filter * -properties passwordlastset, passwordneverexpires -SearchBase "OU=Service Accounts,OU=SG1,OU=AT,DC=wt,DC=ad,DC=cit,DC=cc" |ft Name, passwordlastset, Passwordneverexpires 
 

$expiredDate = $PWdLastSet.passwordlastset.addDays(-365)

---

IA