SQL Server wildcard select with a twist

I am extracting some wildcards from a string type column using certain keywords but for certain keywords in my list i am getting some false positives which I do not want in my output. Some of the keywords in my wildcard select is 'old', 'older' and 'age'

select * from DESCRIPTIONS..LONG
where (DESCR like '% old %'
or DESCR like '% older %'
or DESCR like '% age %'
or DESCR like '%old%'
or DESCR like '%older%'
or DESCR like '%age%')

I want to extract only rows that contain these absolute words but I end up returning strings that include 'management', 'image', 'cold', 'colder' etc. I could remove these true negatives by not looking for the below

DESCR like '%old%'
or DESCR like '%older%'
or DESCR like '%age%'

but in that process I am excluding rows that have special characters like period, comma, slash etc. which are true positives E.g. i would miss strings ending in 'age.' or 'old.' or 'older,' or 'age' when it is the last word in the string without a trailing space.

How do I exclude true negatives and false positives and only get all true positives?

here is a complete list of my keywords separated by a comma.

keywords: newborn, newborns, infant, infants, year, years, child, children, adult, adults, pediatric, old, older, young, younger, age

Thanks