Men in second marriages - How did they meet their second wife ?

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for men who remarry in their 40`s and 50`s, under what circumstances did they first meet and develop a relationship with their second wife ? i`m specifically interested in the pool on middle-class,well-educated men, age 40-59 and living in the U.S. 1. of all men who are divorced or widowed by age 40, what percentage remarry between age 40 and age 59 ? 2. age disparity : for this pool of remarried men, what percentage remarry a woman at least 10 years younger ? 3. circumstances in which they met : for this pool of remarried men, what percentage of these men first met their second wife as : a) a co-worker in the man`s workplace or work-related travel; b) a neighbor; c) introduced by mutual friend; d) met a friend`s party or wedding; e) met at a bar; f) met through internet or other dating/matching service ? 4. i`m also interest in a subjective evaluation : how many of these second marriages are "healthy" relationships ? what is the divorce rate for second marriages ? obviously the available statistics may not be broken out into the categories as i`ve defined them; i`ve simply provided this detail to give specificity to my question. i`m interested in this information as a matter of curiosity, not formal research. All suggestions welcome!