It seems that it’s never too late to be baptized. Even the dead can get this.
Baptism for the dead, vicarious baptism or proxy baptism refers to the religious practice of baptizing a person on behalf of one who is dead. A living person then receives the rite on behalf of a deceased person. Baptism for the dead is best known as a doctrine of the Latter Day Saint movement, practicing it since 1840.
Those who practice this rite view baptism as an essential requirement to enter the Kingdom of God, and therefore practice baptism for the dead to offer it by proxy to those who died without the opportunity to receive it. The Church of Latter Day Saints (Mormon) teaches that those who have died may choose to accept or reject the baptisms done on their behalf.
Another event never too late to preform, is marriage for the dead. Yes, you are reading that. In Chinese tradition, a ghost marriage (pinyin: mínghūn; literally: "spirit marriage") is a marriage in which one or both parties are deceased. Other forms of ghost marriage are practiced worldwide, from Sudan, to France since 1959. The origins of Chinese ghost marriage are largely unknown, and reports of it being practiced today can be found. Chinese ghost marriage was usually set up by the family of the deceased and performed for a number of reasons, including the marriage of an engaged couple before one member's death to integrate an unmarried daughter into a patrilineage to ensure the family line is continued, or to maintain that no younger brother is married before an elder brother. A previously engaged woman upon the death of her fiancée, can choose to go through with the wedding, in which the groom was represented by a white cockerel at the ceremony. However, some women were hesitant since this form of ghost marriage required her to participate in the funeral ritual, mourning customs (including strict dress and conduct standards), take a vow of celibacy, and immediately take up residence with his family. A groom had the option of marrying his late fiancée, with no disadvantages, but there have been no records of such weddings.
Then there is the posthumous marriage (or necrogamy). This is a marriage in which one of the participating members is deceased. It is legal in France and similar forms are practiced in Sudan and China. Since World War I, France has had hundreds of requests each year, of which many have been accepted.
And so it appears you can still be baptized or even marry that special person, even though you are moldering in your grave. Death isn’t the end, but the beginning.