At age 88, his 100th publication in Philosophical Transactions

Date: 
May 1, 1721

At age 88, his 100th publication in Philosophical Transactions, volume 31, number 364 (May, June, July, and August 1721): Observations on the Muscular Fibres of Fish.

Sources
Year Author Title
1665 various Philosophical Transactions
1720 Leeuwenhoek, A. van Observations on the Muscular Fibres of Fish. By Mr. Leeuwenhoeck, F. R. S.