I think you will find majority of 28 year olds regardless of wear and tear are closer to the end than the start
They could also have 3-4 years in them. A lot of 18 year olds are also nearer at the end than the start too... because they will turn out to not be good enough and will also be gone in 3-4 years
Its not wise to close your eyes to older players who for one reason or another havent had many opportunities early in their career.