Please read the following table in Markdown format and then answer the question according to the table. Table cells in one row are seperated by '|', and different rows are seperated by '
'.

Table:
| Year of Marriage | Name | Her Age | His Age | # of Children |
| --- | --- | --- | --- | --- |
| 1835.0 | Louisa Maria Tanner | 17.0 | 22.0 | 8.0 |
| 1843.0 | Diontha Walker | 27.0 | 30.0 | 0.0 |
| 1844.0 | Caroline Partridge | 17.0 | 31.0 | 6.0 |
| 1846.0 | Eliza Maria Partridge | 23.0 | 33.0 | 5.0 |
| 1846.0 | Paulina Eliza Phelps | 19.0 | 33.0 | 7.0 |
| 1846.0 | Priscilla Turley | 17.0 | 33.0 | 6.0 |
| 1846.0 | Cornelia Leavitt | 21.0 | 33.0 | 2.0 |
| 1853.0 | Lydia Partridge | 23.0 | 40.0 | 4.0 |
Question:
What is the mean year of marriage when her age was more than 19 and his age was 30?
Answer:
1843.0