"The findings of the study indicate that age is a strong predictor of psychological well-being." As in, greater age, or younger age? The abstract should make this clear.
Although poor quality studies are not by any means restricted to CAM research, many of the interventions discussed in this review are commonly delivered as part of a holistic approach (i.e. including diet, meditation, or other therapies), that even when the highest standards of research are adhered to, it may be impossible to tease out the effect from a particular therapy when they were never intended as standalones.
There are so many types of yoga (e.g. Hatha, Iyengar, Kundalini), and variances within any type depending on teacher and local expectations, that abstracts/articles that conclude anything about the outcome of a "yoga" intervention basically tells us nothing at all. Was the workout highly cardio in nature, with 6 sun salutations in a row, or was it half meditation and the other half gentle stretching? These types of variations and concomitant results in heart rate and respiration could clearly affect the outcome.
I disagree with the authors' conclusions that "Cultivating a supportive organizational climate toward older employees and offering awareness-based training programs." First, the need for a "supportive organizational climate" is circular reasoning--if co-workers and supervisors are (consciously or unconsciously) acting with a negative bias against older workers, then they are not providing a supportive climate. Further, awareness-based training might have some chance of moving the needle, but it seems more likely that employees will assume that they are not guilty of this largely unconscious bias.
Funding