Ok let me put it this way in a non-aviation example:

Everyone is born with a specific birthday. This birthday determines their age at any given time. People graduate college at a specific date but not everyone is the same age. Prodigies can do it in their early teens while other take into their 20's, 30's, or even decades longer. There is no correlation between a person's age and the time they graduate college.

But what if someone went and tried to look at the date of graduation for a person and tried to determine their age? That would be stupid and illogical because age has absolutely nothing to do with the date a person graduates from college (within reason of course). You can't say 'well this person graduated on date X and this person graduated on date Y, therefore the person who graduated on date X must be older.'. The opposite is also true. You cannot say that person A will graduate before person B simply because person A was born a few weeks ahead of person B.

This is the same setup as trying to take a Pinnacle DOH (graduation) and determine someone's seniority (age). Alternatively you cannot take a persons seniority number and be able to determine their DOH from that information alone. They have nothing to do with each other and thus one cannot be used to determine the other.