No conductor in the 117-year-history of the Boston Symphony Orchestra has been at the helm longer than Seiji Ozawa, who was the guest of honor at a luncheon commemorating his 25th season.

"It was just so fast and so many things happened," Ozawa said Monday of his tenure. "For me this is not my job. This is my life."The guests included Boston Pops conductor Keith Lockhart and former Pops conductor John Williams.

Ozawa, 62, conducted the symphony for the first time on Aug. 16, 1964, as a guest conductor at Tanglewood. He made his first appearance at Symphony Hall in 1968 and was appointed music director in 1972. He recently conducted at the Winter Games in Nagano, Japan.