"Maximum maturity" refers to reaching the highest level of growth, development, or understanding in a particular situation or stage of life. Full definition
However, these policies offer a term, which is usually from 15 to 40 years and is available to individuals from the age 18 to 50 years with maximum maturity age of 65. (business-standard.com)
For most investors it probably doesn't make sense to invest any further out than intermediate bonds or bond funds (10 year maximum maturity) to lower the risk of large losses. (awealthofcommonsense.com)
Also lot of companies have maximum maturity age capped at 65 years to 70 years for term plans. (bachatkhata.com)