This is the Wu Style Tai Chi form I practice.
It’s the traditional long form as demonstrated by Wu Yinghua (1907-1997), daughter of Wu Chien Chuan.
She was probably in her late eighties when she demonstrated the form. The video clip is of poor quality but you can get a flavour of the Wu style form by watching it.
She demonstrated about a third of the long form, from the opening posture to Left and Right Parting Leg (just after the first cloud hands).