A discovery in 1935 of a scrap of papyrus in Egypt which contained parts of John moved its date to around 125 AD. This would mean an even earlier original writting some suggesting 110 AD to allow time to copy and carry to Egypt. Conservatives date it to 85-95 AD while others even earlier to 70 AD due to a verse in John 5:2 about Jerusalem not being destroyed yet. Lastly, John himself, is thought to have died between 95-100 AD at a very old age. As Christ began His ministry when 30 years old and some have dated this to be in 27 AD, John who was the youngest (12-16 in Jewish custom of being a man), then John would have been born in the first/second decade of the 1st Century.Like other writings when the author doesn't identify himself by name, there are often clues given in the context that will help to do this for us. Consider John 21:19-24 where the author calls himself, 'the disciple whom Jesus loved.' This designation occurs only 4 other times in this book. 'This was the disciple who...wrote these things (21:24). So the author had to be one of the twelve Apostles as he is described as leaning on Jesus' bosom at the Last Supper (Mark 14:17).
Yes, he was.
John Writer was born in 1944.
John Moriarty - writer - was born in 1938.
John Dale - writer - was born in 1953.
John Basset - writer - was born in 1791.
John West - writer - was born in 1809.
John Cornwell - writer - was born in 1940.
John Bayley - writer - was born in 1925.
John Brooks - writer - was born in 1920.
John Wyatt - writer - was born in 1925.
John Collier - writer - was born in 1901.
John Braithwaite - writer - was born in 1633.