Ok thank you for your response , Imposing two teachers there, one older than the other, does the age difference between them affect the teaching process?
There may be an age factor, but I think there are too many factors to give a definite answer (secondary vs. university level, geographic location, teacher's education levels, etc). One study (see below) suggests that there is an age where decline happens, but it is subject to much individual variation. Another showed there was no impact of age for "good-looking" professors. Although that study went off of students' perceptions, as opposed to a more quantitative measure of teaching effectiveness.
This discussion brings a couple questions into my mind. How much does a student's perception (due to the age of the teacher) influence the efficiency of teaching (the affective filter of second language acquisition theory comes to mind)? How much of a factor is changing career responsibilities, as opposed to age? As teachers get older, they may have more administrative duties or mentoring/adviser duties that reduce the time they can focus on lesson preparation, etc.
Here are a few references on the subject if you'd like to read:
I have been involved in researching teacher attitudes to inclusion and one finding was interesting with regards to your question. Being a former teacher and school psychologist. The anecdotal comments and beliefs were that older teachers were more cyncical than younger ones, although this was not always to do with age but more precisely length of experience. This was certainly the case with regards to inclusive education. However, I was surprised to find that there was no significant difference between teachers' length of experience regarding atttiudes to inclusive education. Specifically the only significant difference was between one year of experience and two years. Whether a teacher had been working for 30 or 3 years there was no significant difference in attitude.
This seemed to indicate a failing in support for teachers when they were in their first year of employment in high school. I discussed other reasons in the paper (attached) but it was surprising based on what I had hypothesised.
Article Teachers' attitudes towards inclusion in high schools
In learning a foreign language, YES. Age is one of the influential factors. It is believed that after puberty it is so difficult to learn a foreign language accent, because the related muscles lose their plasticity.
This is the first discussion in a long time where everyone agreed. It was interesting that although there was agreement, the factors were, at times different. This discussion might have answered a question I had. If you look at the average age or even age span of faculty at online universities, faculty seem to be older than at traditional schools. This is good news for those who retire, but still want to work part time. While everyone had excellent points, I think Ben stated the case very well.
I don't know about the teachers, but I am an 80 year old student in college for the first time (online). I found that some of the younger teachers are a bit discriminatory against those of us students who are older. I don't know if they feel intimidated or think we are wasting their time inproving our education, or simply have bought into the ageism stereotype. I usually gain a better response from older teachers.